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I <br /> Lancaster Laboratories <br /> • Where quality is a science. <br /> IPage 2 of 4 <br /> Quality Control Summary <br /> Client: Name: ChevronTexaco Group Number. 828797 <br />' Reported: 11/12/02 at 03 :25 PM <br /> Sample Matrix Quality Control <br /> MS MSD XSIMSD RPD BXG DUP DUP Dup <br /> RPD <br />' Analysis Name %RERC %REC Limits RPD MAK Conc Conc RPD Max <br /> Batch number: 02304A16B Sample number(s) : 3930157-3930158 <br /> TPH-GRO - Waters 110 74-132 <br /> Batch number: 023100039A Sample number(s) : 3930154-3930160 <br /> t Methanol (by Direct Injection) 96 96 69-127 0 20 <br /> Batch number: H023071AA Sample number(s) : 3930154-3930155 <br /> Ethanol 99 94 34-163 5 30 <br /> Methyl t-butyl ether 100 99 69-134 1 30 <br /> di-Isopropyl ether 95 93 68-133 2 30 <br /> Ethyl t-butyl ether 93 93 73-123 1 30 <br /> t-Amyl methyl ether 97 95 69-118 2 30 <br /> t-Butyl alcohol 106 103 51-148 3 30 <br /> Benzene 112 109 78-134 2 30 <br />' 1,2-Dichloroethane 106 103 73-136 3 30 <br /> Toluene 111 109 83-127 2 30 <br /> 1,2-Dibromoethane 102 101 78-120 1 30 <br /> Ethylbenzene 113 111 82-134 2 30 <br /> Xylene (Total) 112 ill 82-130 1 30 <br />' atch number: N023082AA Sample number(s) : 3930156-3930161 <br /> atbanol 92 106 34-163 14 30 <br /> Methyl t-butyl ether 97 99 69-134 2 30 <br /> di-Isopropyl ether 91 94 68-133 3 30 <br />' Ethyl t-butyl ether 87 89 73-123 2 30 <br /> t-Amyl methyl ether 92 92 69-118 1 30 <br /> t-Butyl alcohol 100 102 51-148 3 30 <br /> Benzene 110 111 78-134 1 30 <br /> 1,2-Dichloroethane 105 105 73-136 1 30 <br /> Toluene 111 111 83-127 0 30 <br /> 1,2-Dibromoethane 100 99 78-120 0 30 <br /> Ethylbenzene 112 110 82-134 2 30 <br /> Xylene (Total) 111 110 82-130 1 30 <br /> Surrogate Quality Control <br />' Analysis Name: TPH - DRO CA LUFT (Waters) <br /> Batch number: 023040026A <br /> orthoterphenyl <br /> 3930154 96 <br />' 3930155 98 <br /> 3930156 158• <br /> 3930157 0* <br /> 3930158 85 <br /> 3930159 116 <br /> 0 9 <br /> BlankB6 <br /> Blank 96 <br /> LCS 89 <br /> LCSD 93 <br /> *-Outside of specification <br /> The result for one or both determinations was Iess than five times the LOQ. <br />' 2) The background result was more than four times the spike added. <br /> Lancaster Laboratories,Inc. <br />' M E M B E R 2425 New Holland Pike <br /> ® PO Box 12425 <br /> Lancaster, 17605-2425 <br /> 777-656-230000 Fax:717.656-2681 2216 Rev.9/11/00 <br />